In his ravenous hatred he found no peace, and with boiling blood he scoured the umbral plains, seeking vengeance against the dark lords who had robbed him, and those that tasted the bite of his sword named him... the angry cat

Embodiment of rage, revenge, and spite. He swears revenge on all who approached him too fast and didn't slowly approach them and be gentle with them.

That's the key to being a cat whisperer if they run, try and let them come to you first, and gently pet them, let them get a sniff of your hand, trust me I know everything that goes on in a cats brain.

Also yes doom reference I LOVE DOOM.